In/Spectre (虚構推理, Kyokō Suiri, also known as Invented Inference) is a 2011 Japanese novel published by Kodansha and written by Kyo Shirodaira with illustrations by Hiro Kyohara and since volume 2, by Chasiba Katase. A manga adaptation with art by Chasiba Katase has been serialized since April 2015 in Kodansha's shōnen manga magazine Shōnen Magazine R and since October 2019, also on Monthly Shōnen Magazine. It has been collected in nine tankōbon volumes. The manga is published in North America by Kodansha Comics. An anime television series adaptation by Brain's Base premiered on January 11, 2020.